Roughly 43 to 45 million people worldwide are blind, which works out to about 0.5% of the global population. An additional 1 billion people live with some form of vision impairment, ranging from moderate loss to near-total blindness. In the United States specifically, about 1 million people meet the clinical definition of blindness, while another 6 million have significant vision loss that corrective lenses can’t fully fix.
Global Numbers in Context
Out of a world population exceeding 8 billion, the percentage who are fully blind is small, but the broader picture of vision loss is much larger. The International Agency for the Prevention of Blindness estimates that 1.1 billion people currently live with some degree of sight loss. That number is projected to reach 1.7 billion by 2050 as populations age and chronic conditions like diabetes become more common.
The gap between “blind” and “vision impaired” matters. Blindness means a person’s corrected vision in their better eye is 20/200 or worse, meaning they can see at 20 feet what someone with normal sight sees at 200 feet. Many people with vision impairment still have usable sight but struggle with tasks like driving, reading, or recognizing faces at a distance.
Blindness in the United States
The CDC reports that over 7 million Americans have vision loss or blindness based on their best corrected visual acuity. Of those, approximately 1 million meet the threshold for blindness, putting the U.S. blindness rate at roughly 0.3% of the population.
The rates vary significantly by state, with overall vision loss prevalence ranging from 1.3% in Maine to 3.6% in West Virginia. Age is the biggest driver: 20% of all Americans older than 85 experience permanent vision loss. Still, blindness and vision loss aren’t exclusively age-related. More than 1.6 million Americans living with vision loss or blindness are younger than 40.
Leading Causes of Blindness
Five conditions account for the vast majority of blindness and vision impairment worldwide. Cataracts are the single largest cause, responsible for an estimated 94 million cases of distance vision impairment or blindness globally. Cataracts cloud the eye’s natural lens, and while surgery can restore sight in most cases, millions of people in low-income countries lack access to the procedure.
Uncorrected refractive errors, essentially nearsightedness, farsightedness, and astigmatism that could be fixed with glasses, account for another 88.4 million cases. This is one of the most striking numbers in global eye health: tens of millions of people have blurry or impaired vision simply because they don’t have access to an eye exam and a pair of corrective lenses.
The remaining major causes are age-related macular degeneration (8 million cases), glaucoma (7.7 million), and diabetic retinopathy (3.9 million). Glaucoma is particularly dangerous because it damages the optic nerve gradually, often without noticeable symptoms until significant vision is already lost. Diabetic retinopathy, caused by damage to blood vessels in the retina, is rising alongside global diabetes rates.
Most Blindness Is Preventable
An estimated 90% of all sight loss is either preventable or treatable with existing medical tools. That includes cataract surgery, corrective lenses for refractive errors, and early treatment of conditions like glaucoma and diabetic retinopathy before they cause irreversible damage. The fact that cataracts and uncorrected refractive errors top the global list underscores that the problem is largely one of access, not technology.
The economic toll reflects this gap. Global annual productivity losses from sight loss are estimated at $410.7 billion, with $43.6 billion attributed to blindness alone and $367.1 billion to moderate and severe vision impairment. Scaling up access to basic eye care, particularly in sub-Saharan Africa and South Asia where blindness rates are highest, would address a significant share of those losses.
Why the Numbers Keep Growing
Even though treatments exist for most causes of blindness, the total number of people affected is climbing. Two forces are driving that trend. First, populations are aging everywhere. Cataracts, macular degeneration, and glaucoma all become dramatically more common after age 60, and the global population of people over 60 is expected to double by 2050. Second, diabetes is spreading rapidly in middle-income countries, bringing diabetic retinopathy with it.
The projected jump from 1.1 billion to 1.7 billion people with sight loss by 2050 doesn’t mean prevention efforts are failing. It means demographic shifts are outpacing them. The share of blindness cases that go untreated has actually fallen over the past two decades, but the absolute number of people needing care keeps rising.